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Debt (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
May 18, 2023
Debt Instrument [Line Items]      
Outstanding long-term debt current $ 175,654,000 $ 175,615,000  
Long-term principal 1,000,000,000    
Term Loans [Member]      
Debt Instrument [Line Items]      
Outstanding long-term debt current $ 110,000,000    
Debt instrument maturity date 2024    
Revenue Bonds [Member]      
Debt Instrument [Line Items]      
Outstanding long-term debt current $ 65,700,000    
Debt instrument maturity date 2024    
Letter of Credit [Member]      
Debt Instrument [Line Items]      
Line of credit facility, amount outstanding $ 700,000    
Maximum borrowing capacity     $ 75,000,000
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Revolving line of credit borrowings $ 0    
Debt instrument, maturity date Feb. 14, 2027    
Maximum borrowing capacity     300,000,000
Amount available to increase borrowing capacity     500,000,000
Swing Line Loans [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity     $ 25,000,000
Amended Term Loan Agreement [Member]      
Debt Instrument [Line Items]      
Line of credit facility, amount outstanding $ 971,000,000    
Secured Overnight Financing Rate (SOFR) [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.61%    
Secured Overnight Financing Rate (SOFR) [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.30%